first I recomend you take care of the errors
and make it validate.
w/ xhtml, tags that do not have a 'closing tag' ... they 'self close'.... so img, mets, br, etc would be written as such:
<br /> <img src="foo.jpg" />
also theres no reason for that huge block of <br />'s... use padding or margin instead in the css!
also, don't use target="_blank" in xhtml either. If you REALLY want to control browser behavior add it client side with JS/domScripting.